Flotation tank



FIG. 1 is a front perspective front of a flotation tank according to thepresent design;

FIG. 2 is a side perspective view of the flotation tank of FIG. 1;

FIG. 3 is a front view of the flotation tank of FIG. 1;

FIG. 4 is a side view of the flotation tank of FIG. 1; and,

FIG. 5 is a top view of the flotation tank of FIG. 1.

CLAIM The ornamental design for a flotation tank, as shown anddescribed.